scholarly journals Permanent-magnet helicon sources and arrays: A new type of rf plasma

2009 ◽  
Vol 16 (5) ◽  
pp. 057102 ◽  
Author(s):  
Francis F. Chen ◽  
Humberto Torreblanca
Keyword(s):  
Permanent Magnet ◽  
Rf Plasma ◽  
New Type ◽  
Helicon Sources

The Optimization Simulated Analysis of Permanent Magnet Linear Synchronous Motor

2011 ◽  
Vol 101-102 ◽  
pp. 538-542
Author(s):  
Hai Jun Tan ◽  
Mei Qin Zhang ◽  
Cheng Tang ◽  
Lei Li
Keyword(s):  
Permanent Magnet ◽  
Design Theory ◽  
Synchronous Motor ◽  
Electromagnetic Analysis ◽  
Positioning Accuracy ◽  
Finite Element Software ◽  
Transient Electromagnetic ◽  
Linear Synchronous Motor ◽  
New Type ◽  
Simulated Analysis

Permanent magnet linear synchronous motor (PMLSM) is a new type of motor with high positioning accuracy. This paper introduces the related design theory of PMLSM with the utilization of finite element software. we refer to the sample transient electromagnetic analysis, firstly. And then get the Thrust fluctuation map and compare to its winding back EMF curve and other related graphs. Through altering of the thickness, air gap length, junior core’s structure and size and other parameters, we finally conclude the designed requirements will be eventually fulfilled this optimization.

The ESRF Insertion Devices

1998 ◽  
Vol 5 (3) ◽  
pp. 196-201 ◽  
Author(s):  
Joel Chavanne ◽  
Pascal Elleaume ◽  
Pierre Van Vaerenbergh
Keyword(s):  
Synchrotron Radiation ◽  
Permanent Magnet ◽  
Permanent Magnets ◽  
European Synchrotron Radiation Facility ◽  
Harmonic Numbers ◽  
New Type ◽  
Almost All ◽  
Field Errors ◽  
Field Integral ◽  
Significant Effort

The European Synchrotron Radiation facility is presently operating 47 segments of insertion devices (IDs). A record brilliance of 1 × 1020 photons s−1 (0.1% bandwidth)−1 mm−2 mrad−2 has been reached. Almost all devices are built with permanent magnets with or without iron pole pieces. They have been mechanically and magnetically designed and field-measured in house. Multipole shimming has been applied to all devices to remove the integrated dipole and higher-order multipole fields, thereby reducing the interaction between the IDs and the stored beam. For all undulators, the field errors have been corrected further using spectrum shimming in order to achieve ideal spectral brilliance on all harmonic numbers from 1 to 15. A significant effort has been made to optimize the magnet terminations for both field-integral correction and phasing. A phasing scheme of the undulator segments has been developed which allows the independent manufacture and operation of individual segments. Several designs for undulator phasing are presented, together with a comparison between hybrid and pure-permanent-magnet technology. A new type of variable-polarization helical undulator is presented.

Research of AGV Variable Frequency Speed Regulation System Based on New Type PMSM

2014 ◽  
Vol 1049-1050 ◽  
pp. 846-849
Author(s):  
Ying Hai Wang ◽  
Hao Ming Zhang ◽  
Lian Soon Peh
Keyword(s):  
Magnetic Field ◽  
Permanent Magnet ◽  
Power Density ◽  
Permanent Magnet Synchronous Motor ◽  
Air Gap ◽  
Regulation System ◽  
Variable Frequency ◽  
Environment Friendly ◽  
Speed Regulation ◽  
New Type

Halbach motor is a new type permanent magnet synchronous motor: unique permanent magnet structure makes its magnetic field unilateral and distributed sinusoidal, increases the magnetic density of air gap while decreases the magnetic density of rotor. It helps to raise the power density and efficiency of power, reduces the size of motor and the pulsating torque. The full-digital variable frequency adjustable speed AGV system with halbach motor based on the TMS320F2812 is designed, and its experiment result proves that it performed well and environment-friendly, saving the energy as well.

Design and Fabrication of a MEMS AC Electric Current Sensor

2008 ◽  
Vol 54 ◽  
pp. 350-355 ◽  
Author(s):  
Eli S. Leland ◽  
Richard M. White ◽  
Paul K. Wright
Keyword(s):  
Permanent Magnet ◽  
Electric Current ◽  
Permanent Magnets ◽  
Analytical Models ◽  
Current Sensor ◽  
Piezoelectric Cantilever ◽  
New Type ◽  
Self Powered ◽  
Network Technologies ◽  
Device Sensitivity

The need for energy efficiency combined with advances in compact sensor network technologies present an opportunity for a new type of sensor to monitor electricity usage in residential and commercial environments. A novel design for a self-powered, proximity based AC electric current sensor has been developed. This sensor device is constructed of a piezoelectric cantilever with a permanent magnet mounted to the cantilever's free end. When the sensor is placed in proximity to a wire carrying AC electric current, the permanent magnet couples to the wire's alternating magnetic field, deflecting the piezoelectric cantilever and thus producing a sinusoidal voltage proportional to the current being measured. Analytical models were developed to predict the magnetic forces and piezoelectric voltage output pertaining to this design. MEMS-scale cantilevers are currently under development using a three-mask process and aluminum nitride as the active piezoelectric material. Very small (300 μm) permanent magnets have been dispenser-printed using magnetic powders in a polymer matrix. Previously presented meso-scale (2-3 cm3) prototype devices exhibited sensitivities of 74 mV/A, while simulations suggest MEMS device sensitivity of 2-4 mV/A.

scholarly journals Nanocomposite permanent magnetic materials Nd-Fe-B type: The influence of nanocomposite on magnetic properties

2005 ◽  
Vol 41 (1) ◽  
pp. 95-102 ◽  
Author(s):  
Nadezda Talijan ◽  
Jasna Stajic-Trosic ◽  
Aleksandar Grujic ◽  
Vladan Cosovic ◽  
Vladimir Menushenkov ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Heat Treatment ◽  
Magnetic Properties ◽  
Permanent Magnet ◽  
Exchange Coupling ◽  
Coupling Effect ◽  
Soft Magnetic ◽  
Magnetic Phases ◽  
New Type ◽  
Permanent Magnet Materials

The influence on the magnetic properties of nanocristalline ribbons and powders has character of microstructure, between others ? the grain size volume of hard and soft magnetic phases and their distribution. Magnetic properties of ribbons and powders depend mainly on their chemical composition and parameters of their heat treatment [1]. Technology of magnets from nanocristalline ribbon consists of the following process: preparing the Nd-Fe- B alloy, preparing the ribbon, powdering of the ribbon, heat treatment of the powder and finally preparing the magnets. Nanocomposite permanent magnet materials based on Nd-Fe- B alloy with Nd low content are a new type of permanent magnetic material. The microstructure of this nanocomposite permanent magnet is composed of a mixture of magnetically soft and hard phases which provide so called exchange coupling effect.

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